I correct myself the bug by changing the virtual resolution in the Xorg :
Section "Screen"
        Identifier      "Configured Screen Device"
        Device  "Configured Video Device"
        SubSection "Display"
                Virtual 2560 2048
        EndSubSection
EndSection

Section "Device"
        Identifier      "Configured Video Device"
EndSection

Why the default resolution didn't was 2560 ? I also think that gnome-
display-prophetie didn't change xorg.conf when I apple the dual screen
extended configuration.

-- 
[Karmic] Display problem with extended desktop
https://bugs.launchpad.net/bugs/446536
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